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I had that problem too. I took the realy bad rocks out and hosed them out good then let them bake under the sun for a few days. For the rocks that only had a few I just injected the lil boogers with boiling water. It killed them instantly.
Solid PVC or acrylic rods are probably best. Don't use coat hangers because the iron in it will corrode and leech into the water. There's a great article in the 2013 Coral&Reef USA about how iron can contribute to the death of a reef.